Typewriter



Fue@ sept. 16, 1921 Etta wz py 4 sheets-sheet l Feb. 2 7, 1923.

A. R. G. VOGT TYPEWRITER Fi l ed Sept. 16, 1921 4 sheets-sheet 2./Ztorney.

l Feb. 27, 1923. 1,446,951

A'. R. G. VOGT TYPEWRITER .Filed Sept'. 16, 1921 4 sheets-sheet 5 Feb.27, 1923. 1,446,951

A. R. G. VOGT TYPEWRITER Filled Sept. 16, 1921 4' sheetssheet 4 vPatented F eb. 27, 1923..

heeel 'fr orties.

ALFRED RICHARD ences w'loevr,v or 'oi'-rElifIi\T'.iz,Y GERMANY,Assieivoia To THE 'riaivrz WANDERER WERKE-VORM.- WINKLHOFER a JAENICKEA. G., or soHoNAmNnait cnniiuvirz, GERMANY.

`Application' ined september 1e,y 1921. seri'ai N0.v5o1`,'153.

To all whom t may concern Be it known that I, ALFRED RICHARD GEORG Voor,a citizen of the GermanvRepublic, and a residentot Chemnitz, Saxony,

Germany, have invented certain new and useful improvements v'inTypewriters, l of which the followingv is a specification.

This invention relates to a case-shift device for typewritinglmachines'ot theV kind where means for multi-case-shift, 'for instancedouble case-shift, are provided and in which the platen may be -liftedorlowered tor equal lengths-of way from its central or normal. positionwhich is atl thesame'time its position of rest,""and may be locked inthe `middle positions. f

It is already known to effect such reversals by means "of bell-cranklevers, knee-joints, curved guides,'or the like, but all these meanshave more or less the drawback that they must `be'veryexactlyffmanufac'tured. `But even then'a certain play in'thelinkconnections, bearing places, etc., is unavoidable, becomesperceptible by its detrimental effects especiallyafter longer use, andcan be ob- `viated either but very ditiicultly lor not'all. This playentails 'aneXcess of motion of the Vplaten fin its'middle'positionwherebythe written line be'coines bent.

The object of the' present invention' is to obviate these drawbacks, andthe means for this 'purposev consist in av combination'and arrangementof' parts, the chi'effeatures of whichare the following: 'The platenisfsupvported in a platen 'frame which, in 'its' turn, vis supportedupon'a shiftable supporting frame; case-shift'leverscontrol the shiftingof said 'latter' frame; the 'supporting' frame 'from a 'central'or'normal position to anupemployed in tlienovel mechanism 'is connected-with 1the shiftable parts nly' during the lifting and the lowering,whereas when yner andi at the vproper time. other springs than `thoserequisite for m0v rposition of the parts` after the levers'ensure thecentral or normal position of the platen. Angular adyusting membersVallow a convenient and suitable adjustment fand re-adju'stment of theplaten as regards ingfthe case-shift key levers back into their "fermerposition,` which entails, besides a favorable key lever ratio, a smoothworking of 'the mechanism, as well as a small expenditure oi power lforoperating it.

11i-order tomake my invention more clear,

"I refer' to vthe'accoinpanying drawings, in which isiinilar vlettersdenote similar parts -throughout the "several views, and in which fFig.1 is a side view of the mechanism, the platen being'in its middleposition;Fig. 2 is a planl of thek parts shown in Fig.` "1, the

platen and 'its frame being, however, left away;` Fig. 3 isfa detail ofthe lower part -of the righthand sidel'of Fig. l; Fig-4 is afront-viewer 'theflefthand end of the parts illustrated in the middlepart of the-"rightkhand side of Fig. 1;' Fig; 5 is v'anillustration`similar to Fig. 1 showing the pesitionof the parts after the platenyhas been lifted; and

Fig. 6 is a similarr illustration"showingv the platen has been lowered.e

The 'platen 1 is supported ina known man- `ner ina frame 2 which may belifted 'and *lowered togetherwithsaid platen and all has'y twooase-shift' positions, vbeing movable othervv parts connected with it."The part y l "of theifi'ame 2 below the platen 1 consists of per or toa lower'one. Thev system of levers a rod s'upported by a roll 5 carriedby the *case-shift frame 4 which is movably con- 4"Fneet'ed l'atits3lower end by links 7 with an axle 7 f'held between *serews 8 lpassinglthreugli projections 6"'of the frame 6. The -links 7 andthe case-shiftframe 4 are conne'e'tedv with each other by screws 9.

Viria, ease-shia key levers io mi ii (rigs.v

1, l2, 5, and'lare' attached tol the"mac`hine frame by screws 12' andheld in their proper Velevated position byspringsrlt afiiired at their'.upper ends to the levers 10 and 11 and at their lower'enfds to lpinslscrewed into the frame, 'rile aver io has at as rear arm 10a -a holereceiving a pin or pivot 16 secured T1' 1 to a link or push member 15(rigs: 1, 4, o) provided with an angular slot 15a through which extendsa screw 17 screwed into the frame of the machine. @wingto the slot A151being angular, the link or member 15 performs av swinging motion'if itis lifted or lowered by the case-shift key lever 10, 10a. A screw 18also screwed into the machine frame supports a double-armed lockinglever 19, the lower arm of which has a slot 19a and .is coupled with themember- 15 by a pin 2O affixed to the upper end offthis member andextending through said slot 19. Owing to this connection, the lockinglever 19 may be oscillated by the push member 15. The upper end of thelever 19 forms Aa nose 19b ywhich'niayengage an angular locking member21 (Fig. 1) connected with the Vcase-shift frame Abyan adjustingscrew`22 .screw 17). The member 27 is coupled with a locking lever 24 bymeans of a pin 2O affixed to it,'and by a slot 24a provided in the lever24. This latter is attached to the 'frame by the screw 18. Thek upperend of the lever 24 forms a nose 24h' which cooperates with an angularadjusting mem- .ber y21 affixed t0 the case-shift frame by an adjustingscrew 22 and a iiXing screw 23.

1n the position of rest of theplaten the nose 24b engages the member 21from below andA prevents the platen, or the platenframe l2 respectivelyfrom sinking.v y.

The manner of operation of the device is as follows: i

lf the case-shift lever 1() is depressed (Fig.

y 5), its short arm 10a swings upwards and is further depressed.

lifts the push member 15 which, owing to the shape of its guide-slot15a, gets into the path of the case-shift frame 4 and-below thisl latterin order to lift it when the key During that vmotion of the member 15the locking lever 19 has been turned to the left (F ig. 5) because thepin 20 of said member has moved into the upper part of the slot 19a,whereby the nose 19b has been drawn oft' lthe angular member 2l. rlhecase-shift frame 4 is now free to be moved upwards. until it contactswith an abutment provided for the purpose.l

`When the `pressure is removed from the key of the case-shift lever 10,the spring 14 moves the whole system ofleversy back into its formerpositOn, whereasthe'. shiftable parts are moved into a medium positionby` means of a spring not shown in the drawing. ff@ the case-shift keylever 11 has not changgged its position duringthe just-mentionedmovement of the other parts and stops thereturrel ing case-shift framewhen arrivinginv its middle position. After said frame has arrived inthis position, the locking lever swings back into its locking position,whereas the push member 15 swings to the left,

he locking lever 24 which is connectedv with v i. e., away from the pathofffthe case-shift y frame and, thus, fromthis frame itself.

In order t0 vshift the platen. downwards into `its deepest positiomthecase-shift key 11 isdepressed (Figs. 1 and 6). By 'this movement thepull member 27 is drawn downwards bythe mediation of the intermediatelever 25, and 'owing to the vangularity of the" slot 27a of saidmemberv27 through which the pin 117 passes, the said member is swung to theright audits hookshaped upper end engages an aperture otf the case-shiftframe4 s0 as to draw this frame further down when the key 11 is furtherYdepressed. The angular motion o f the pull member 27 is 'transmitted bypin 20 and thev angularfslot 24u of the locking .lever 24 to this lever,the nose 24b of which lswings to the left, that is to say: away from thepath of case-shift frame. This latter, together with .the platen,.maynow glide down until it contacts withan abutment provided for thatpurpose but not shown 1n the drawing. I i. 4 lWhen letting loose thekey11, allthe parts `.actuated in the before-described manner are returnedinto their middle position, partly under the effect of' ther spring u14,` partly under the effect of another spring acting uponv thecase-'shift frame 4, but also not shown in the drawing. The parts arethen stopped in their middle position yby the nose 19b of the firstlockinglever 19,'.the position of which had not been changed. The noseagain the angularmember 215v whereby the platen is again lockedin'itsniiddle position. lThe device isi-arranged upon both sides of thetypewriting machine and the motion is .transmitted from the oneside tothe other by the levers 28 which are firmly connected with a hollowshaft 30 `carried* by an axley 29. The levers 28 have slots lengaged bypins 32 (Fig. 2), firmly connectedwith the case-shift key levers 10 and11.

Having now described iny'invention, what l claim as `new and desiretosecure by Letters Patent of the. United States is A. case-shift devicefor vthe platen of` typewriting machines having means for mul-,ti-'case-shift, comprising in combination:

a platen; a platen-frame; a shiftable frame supporting said platen frameand having We CaSe-Shift 1,00.steiilsv and being adapted 110 24b of thelockinglever `24 engages, finally,

to be moved from a central or normal position to an upper or toa .lowerone; t-Wo double-armed loclrinfy levers arranged et the machine framebeing adapted to look said platen traine in its middle position againstupward and downward position; an angular elo-t in the lou-:e arm oifeach of said le g tiro ddiblered cese-shitt key levers; an iipcwardlyldirected push meii'iber hinged to the rear arm of one of said levers; enupwardly directed pull member hinged t@ the erm oi? the other oi' saidlevers;A

an angular Slot in each ot said members; `a stationary guidemember foreach of these slots; and e pin provided in the pull member and in thepush member and extending; sseeiate slet ot the associate for thepurpose set forth.

"t device fer the i3-laten o type- ;1 hines having means formultireversel, Comprising m combination.: a p-t f r -n-i vfue; eshiitable 'frame ion to en upper or to a lower one; tWo` double-armedlocking levers arranged at the machine iran e and bein;` adapted to locksaid platen frame in its middle position againstupWa-rd and downwardposition; an enguler slot-in the lower arm of each. of seid levers; twodouble-armed cese-shift key levers; `pivots for said locking levers,said pivots being located immediately in liront o1c said cese-shiftframe; en upwardly directed. push member hinged to the rear arm ot oneot seid levers; an upwardly directed pullmember hinged to the rear armof the other oit said levers an angular slot in each of said members; astationary guide member for each ot these slots; and a pin providedinthe pull member and in the push member and extending through theassociate slot of the eseoeiate locking lever; said push member and )ullmember being out of engagement -Vwith the said case-shift trame inmiddle position of the same and the said locking levers taking up thepressure and the pull et the oaseeshiilt trame yvertically with re sheetto the Centre of their pivots, substantially as shown and described.

ln `Witness whereof l have hereunto set my hand in presence ot twowitnesses.

ALFRED RICHARD GEORG VOGT.

lVitnesses V:

MAX HOFMANN, ARTHUR EUGEN PFEOFER.

